Hi all,

is it possible to have 2 screen in DOS? you know how a Windows Machine allows you to expand the desktop over more then one unit can this be done in DOS?

I don't really think that's possible. If it's a purely DOS application, you'd need to see what interrupts you can make to your graphics card through the DOS API and the BIOS. I'm not saying it's impossible but I know it's probably done by making an interrupt to the BIOS through an interrupt (or IRQ). Best idea might be to look for a small GUI-OS like MenuetOS or VisOpSys and see if it supports dual monitors. Then see what they use to interact with it.

Yes it's possible. But you need to add a monochrome/hercules graphics card and 9-pin TTL monitor. (You can't use two VGA cards or a dual-head VGA card.)

Then to switch the active monitor in DOS you type "MODE MONO" or "MODE CO80".